President Park Geun-hye

S Korea sees largest protests against President Park Geun-hye

Ms Park is accused of allowing her friend, Choi Soon-sil, to manipulate power from behind the scenes.

The president has apologised twice on national television, but has so far resisted calls to resign.

Organisers said 1.3 million had gathered in capital Seoul on Saturday night, despite cold weather and snow.

They expect another half a million protesters to turn out in other regions.

However police put the turnout at about 260,000. About 25,000 officers were being deployed in the capital, local media said.

South Korea: Protestors demand President Park resignation

Police estimated that around 12,000 demonstrators attended the evening protest, according to the country's semi-official Yonhap news agency.

South Korea's president faces scrutiny for allegedly leaking state documents to a friend.

On Friday, Park Geun-hye ordered the resignation of 10 of her senior secretaries as political turmoil continued to grip the country.